On Feb 10, 2020, David Christensen wrote: > [...] > It has the following expansion slots: > > - One PCI Express 2.0 x16 add-in card connector > - One PCI Express 2.0 x4 add-in card connector > - One PCI Express 2.0 x1 add-in card connector > > a. While migrating backup data, I recently saw a Syba PCIe x1 two > port SATA II 3 Gb/s HBA model SD-SA2PEX-2IR throttling under > sustained load -- it ran at 80-100 MB/s for 4-5 minutes, then at > ~7 MB/s for two hours. Unacceptable. That controller makes no sense -- I think someone made a typo somewhere on the specs (says it's a 2.5 Gb/sec PCIe x1 interface -- maybe they meant it's PCIe 1.0 compliant, at 2.5 "gigatransfers" per second). As I recall, PCIe 1.0 was in the neighborhood of 200MB/sec sustained for a x1 slot; couple that with a slowish (or damaged) drive, or a RAM-starved system, and a 7MB/sec transfer isn't exactly outside the realm of possibilities. Granted, age of the card could also be a factor. -- |_|O|_| |_|_|O| Github: https://github.com/dpurgert |O|O|O| PGP: 05CA 9A50 3F2E 1335 4DC5 4AEE 8E11 DDF3 1279 A281
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